blob: dc487b5d11568f9ebcfec033ee0bc47f6d34ece0 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 *
Marcel Holtmann0372a662005-10-28 19:20:45 +02003 * Bluetooth HCI UART driver
4 *
5 * Copyright (C) 2000-2001 Qualcomm Incorporated
6 * Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com>
7 * Copyright (C) 2004-2005 Marcel Holtmann <marcel@holtmann.org>
8 *
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070024 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <linux/module.h>
27
28#include <linux/kernel.h>
29#include <linux/init.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <linux/types.h>
31#include <linux/fcntl.h>
32#include <linux/interrupt.h>
33#include <linux/ptrace.h>
34#include <linux/poll.h>
35
36#include <linux/slab.h>
37#include <linux/tty.h>
38#include <linux/errno.h>
39#include <linux/string.h>
40#include <linux/signal.h>
41#include <linux/ioctl.h>
42#include <linux/skbuff.h>
43
44#include <net/bluetooth/bluetooth.h>
45#include <net/bluetooth/hci_core.h>
46
47#include "hci_uart.h"
48
Marcel Holtmann0372a662005-10-28 19:20:45 +020049#define VERSION "2.2"
50
Linus Torvalds1da177e2005-04-16 15:20:36 -070051static struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];
52
53int hci_uart_register_proto(struct hci_uart_proto *p)
54{
55 if (p->id >= HCI_UART_MAX_PROTO)
56 return -EINVAL;
57
58 if (hup[p->id])
59 return -EEXIST;
60
61 hup[p->id] = p;
Marcel Holtmann0372a662005-10-28 19:20:45 +020062
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 return 0;
64}
65
66int hci_uart_unregister_proto(struct hci_uart_proto *p)
67{
68 if (p->id >= HCI_UART_MAX_PROTO)
69 return -EINVAL;
70
71 if (!hup[p->id])
72 return -EINVAL;
73
74 hup[p->id] = NULL;
Marcel Holtmann0372a662005-10-28 19:20:45 +020075
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 return 0;
77}
78
79static struct hci_uart_proto *hci_uart_get_proto(unsigned int id)
80{
81 if (id >= HCI_UART_MAX_PROTO)
82 return NULL;
Marcel Holtmann0372a662005-10-28 19:20:45 +020083
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 return hup[id];
85}
86
87static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type)
88{
89 struct hci_dev *hdev = hu->hdev;
Marcel Holtmann0372a662005-10-28 19:20:45 +020090
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 /* Update HCI stat counters */
92 switch (pkt_type) {
93 case HCI_COMMAND_PKT:
94 hdev->stat.cmd_tx++;
95 break;
96
97 case HCI_ACLDATA_PKT:
98 hdev->stat.acl_tx++;
99 break;
100
101 case HCI_SCODATA_PKT:
Karl Beldan7f8f2722010-10-07 21:57:10 +0200102 hdev->stat.sco_tx++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 break;
104 }
105}
106
107static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu)
108{
109 struct sk_buff *skb = hu->tx_skb;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200110
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 if (!skb)
112 skb = hu->proto->dequeue(hu);
113 else
114 hu->tx_skb = NULL;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200115
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 return skb;
117}
118
119int hci_uart_tx_wakeup(struct hci_uart *hu)
120{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
122 set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
123 return 0;
124 }
125
126 BT_DBG("");
127
Felipe Balbida64c272014-04-23 09:58:26 -0500128 schedule_work(&hu->write_work);
129
130 return 0;
131}
132
133static void hci_uart_write_work(struct work_struct *work)
134{
135 struct hci_uart *hu = container_of(work, struct hci_uart, write_work);
136 struct tty_struct *tty = hu->tty;
137 struct hci_dev *hdev = hu->hdev;
138 struct sk_buff *skb;
139
140 /* REVISIT: should we cope with bad skbs or ->write() returning
141 * and error value ?
142 */
143
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144restart:
145 clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
146
147 while ((skb = hci_uart_dequeue(hu))) {
148 int len;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200149
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
Alan Coxf34d7a52008-04-30 00:54:13 -0700151 len = tty->ops->write(tty, skb->data, skb->len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 hdev->stat.byte_tx += len;
153
154 skb_pull(skb, len);
155 if (skb->len) {
156 hu->tx_skb = skb;
157 break;
158 }
Marcel Holtmann0372a662005-10-28 19:20:45 +0200159
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700160 hci_uart_tx_complete(hu, bt_cb(skb)->pkt_type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 kfree_skb(skb);
Marcel Holtmann0372a662005-10-28 19:20:45 +0200162 }
163
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
165 goto restart;
166
167 clear_bit(HCI_UART_SENDING, &hu->tx_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168}
169
Johan Hedberg9f2aee82012-07-16 16:12:11 +0300170static void hci_uart_init_work(struct work_struct *work)
171{
172 struct hci_uart *hu = container_of(work, struct hci_uart, init_ready);
173 int err;
174
175 if (!test_and_clear_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
176 return;
177
178 err = hci_register_dev(hu->hdev);
179 if (err < 0) {
180 BT_ERR("Can't register HCI device");
181 hci_free_dev(hu->hdev);
182 hu->hdev = NULL;
183 hu->proto->close(hu);
184 }
185
186 set_bit(HCI_UART_REGISTERED, &hu->flags);
187}
188
189int hci_uart_init_ready(struct hci_uart *hu)
190{
191 if (!test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
192 return -EALREADY;
193
194 schedule_work(&hu->init_ready);
195
196 return 0;
197}
198
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199/* ------- Interface to HCI layer ------ */
200/* Initialize device */
201static int hci_uart_open(struct hci_dev *hdev)
202{
203 BT_DBG("%s %p", hdev->name, hdev);
204
205 /* Nothing to do for UART driver */
206
207 set_bit(HCI_RUNNING, &hdev->flags);
Marcel Holtmann0372a662005-10-28 19:20:45 +0200208
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 return 0;
210}
211
212/* Reset device */
213static int hci_uart_flush(struct hci_dev *hdev)
214{
David Herrmann155961e2012-02-09 21:58:32 +0100215 struct hci_uart *hu = hci_get_drvdata(hdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 struct tty_struct *tty = hu->tty;
217
218 BT_DBG("hdev %p tty %p", hdev, tty);
219
220 if (hu->tx_skb) {
221 kfree_skb(hu->tx_skb); hu->tx_skb = NULL;
222 }
223
224 /* Flush any pending characters in the driver and discipline. */
225 tty_ldisc_flush(tty);
Alan Coxf34d7a52008-04-30 00:54:13 -0700226 tty_driver_flush_buffer(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227
228 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
229 hu->proto->flush(hu);
230
231 return 0;
232}
233
234/* Close device */
235static int hci_uart_close(struct hci_dev *hdev)
236{
237 BT_DBG("hdev %p", hdev);
238
239 if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
240 return 0;
241
242 hci_uart_flush(hdev);
David Newall3611f4d2008-02-11 21:41:30 -0800243 hdev->flush = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 return 0;
245}
246
247/* Send frames from HCI layer */
Marcel Holtmann7bd8f092013-10-11 06:19:18 -0700248static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249{
Marcel Holtmann52bc4232013-10-11 07:01:03 -0700250 struct hci_uart *hu = hci_get_drvdata(hdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
252 if (!test_bit(HCI_RUNNING, &hdev->flags))
253 return -EBUSY;
254
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700255 BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type, skb->len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256
257 hu->proto->enqueue(hu, skb);
258
259 hci_uart_tx_wakeup(hu);
Marcel Holtmann0372a662005-10-28 19:20:45 +0200260
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 return 0;
262}
263
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264/* ------ LDISC part ------ */
265/* hci_uart_tty_open
Chan-yeol Park1687dfc2013-04-02 21:24:23 +0900266 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 * Called when line discipline changed to HCI_UART.
268 *
269 * Arguments:
270 * tty pointer to tty info structure
Chan-yeol Park1687dfc2013-04-02 21:24:23 +0900271 * Return Value:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 * 0 if success, otherwise error code
273 */
274static int hci_uart_tty_open(struct tty_struct *tty)
275{
Jiri Slabyf327b342012-10-18 22:26:34 +0200276 struct hci_uart *hu;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277
278 BT_DBG("tty %p", tty);
279
Alan Coxc19483c2010-10-22 14:11:26 +0100280 /* Error if the tty has no write op instead of leaving an exploitable
281 hole */
282 if (tty->ops->write == NULL)
283 return -EOPNOTSUPP;
284
Valentin Iliea08b15e2013-08-12 18:46:00 +0300285 hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL);
286 if (!hu) {
Marcel Holtmann77851622006-09-21 16:23:19 +0200287 BT_ERR("Can't allocate control structure");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 return -ENFILE;
289 }
Marcel Holtmann0372a662005-10-28 19:20:45 +0200290
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 tty->disc_data = hu;
292 hu->tty = tty;
Alan Cox33f0f882006-01-09 20:54:13 -0800293 tty->receive_room = 65536;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294
Johan Hedberg9f2aee82012-07-16 16:12:11 +0300295 INIT_WORK(&hu->init_ready, hci_uart_init_work);
Felipe Balbida64c272014-04-23 09:58:26 -0500296 INIT_WORK(&hu->write_work, hci_uart_write_work);
Johan Hedberg9f2aee82012-07-16 16:12:11 +0300297
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 spin_lock_init(&hu->rx_lock);
299
300 /* Flush any pending characters in the driver and line discipline. */
Marcel Holtmann0372a662005-10-28 19:20:45 +0200301
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 /* FIXME: why is this needed. Note don't use ldisc_ref here as the
303 open path is before the ldisc is referencable */
Marcel Holtmann0372a662005-10-28 19:20:45 +0200304
Alan Coxc65c9bc2009-06-11 12:50:12 +0100305 if (tty->ldisc->ops->flush_buffer)
306 tty->ldisc->ops->flush_buffer(tty);
Alan Coxf34d7a52008-04-30 00:54:13 -0700307 tty_driver_flush_buffer(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
309 return 0;
310}
311
312/* hci_uart_tty_close()
313 *
314 * Called when the line discipline is changed to something
315 * else, the tty is closed, or the tty detects a hangup.
316 */
317static void hci_uart_tty_close(struct tty_struct *tty)
318{
319 struct hci_uart *hu = (void *)tty->disc_data;
Johan Hedbergdac670b2012-07-16 16:12:10 +0300320 struct hci_dev *hdev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321
322 BT_DBG("tty %p", tty);
323
324 /* Detach from the tty */
325 tty->disc_data = NULL;
326
Johan Hedbergdac670b2012-07-16 16:12:10 +0300327 if (!hu)
328 return;
Marcel Holtmann22ad4202007-05-09 09:15:40 +0200329
Johan Hedbergdac670b2012-07-16 16:12:10 +0300330 hdev = hu->hdev;
331 if (hdev)
332 hci_uart_close(hdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333
Felipe Balbida64c272014-04-23 09:58:26 -0500334 cancel_work_sync(&hu->write_work);
335
Johan Hedbergdac670b2012-07-16 16:12:10 +0300336 if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) {
337 if (hdev) {
Johan Hedberg9f2aee82012-07-16 16:12:11 +0300338 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
339 hci_unregister_dev(hdev);
Johan Hedbergdac670b2012-07-16 16:12:10 +0300340 hci_free_dev(hdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 }
Johan Hedbergdac670b2012-07-16 16:12:10 +0300342 hu->proto->close(hu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 }
Johan Hedbergdac670b2012-07-16 16:12:10 +0300344
345 kfree(hu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346}
347
348/* hci_uart_tty_wakeup()
349 *
350 * Callback for transmit wakeup. Called when low level
351 * device driver can accept more send data.
352 *
353 * Arguments: tty pointer to associated tty instance data
354 * Return Value: None
355 */
356static void hci_uart_tty_wakeup(struct tty_struct *tty)
357{
358 struct hci_uart *hu = (void *)tty->disc_data;
359
360 BT_DBG("");
361
362 if (!hu)
363 return;
364
365 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
366
367 if (tty != hu->tty)
368 return;
369
370 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
371 hci_uart_tx_wakeup(hu);
372}
373
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374/* hci_uart_tty_receive()
Chan-yeol Park1687dfc2013-04-02 21:24:23 +0900375 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 * Called by tty low level driver when receive data is
377 * available.
Chan-yeol Park1687dfc2013-04-02 21:24:23 +0900378 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 * Arguments: tty pointer to tty isntance data
380 * data pointer to received data
381 * flags pointer to flags for data
382 * count count of received data in bytes
Chan-yeol Park1687dfc2013-04-02 21:24:23 +0900383 *
Linus Torvalds55db4c62011-06-04 06:33:24 +0900384 * Return Value: None
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 */
Linus Torvalds55db4c62011-06-04 06:33:24 +0900386static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data, char *flags, int count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387{
388 struct hci_uart *hu = (void *)tty->disc_data;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200389
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 if (!hu || tty != hu->tty)
Linus Torvalds55db4c62011-06-04 06:33:24 +0900391 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392
393 if (!test_bit(HCI_UART_PROTO_SET, &hu->flags))
Linus Torvalds55db4c62011-06-04 06:33:24 +0900394 return;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200395
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 spin_lock(&hu->rx_lock);
Linus Torvalds55db4c62011-06-04 06:33:24 +0900397 hu->proto->recv(hu, (void *) data, count);
Chan-yeol Park788f0922013-04-02 21:24:22 +0900398
399 if (hu->hdev)
400 hu->hdev->stat.byte_rx += count;
401
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 spin_unlock(&hu->rx_lock);
403
Alan Cox39c2e602008-04-30 00:54:18 -0700404 tty_unthrottle(tty);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405}
406
407static int hci_uart_register_dev(struct hci_uart *hu)
408{
409 struct hci_dev *hdev;
410
411 BT_DBG("");
412
413 /* Initialize and register HCI device */
414 hdev = hci_alloc_dev();
415 if (!hdev) {
416 BT_ERR("Can't allocate HCI device");
417 return -ENOMEM;
418 }
419
420 hu->hdev = hdev;
421
Marcel Holtmannc13854c2010-02-08 15:27:07 +0100422 hdev->bus = HCI_UART;
David Herrmann155961e2012-02-09 21:58:32 +0100423 hci_set_drvdata(hdev, hu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424
425 hdev->open = hci_uart_open;
426 hdev->close = hci_uart_close;
427 hdev->flush = hci_uart_flush;
428 hdev->send = hci_uart_send_frame;
David Herrmann6935e0f2012-03-09 15:53:42 +0100429 SET_HCIDEV_DEV(hdev, hu->tty->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430
Johan Hedberg63c7d092010-07-12 11:37:04 -0300431 if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
432 set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
433
Marcel Holtmann6afd04a2014-07-11 07:12:58 +0200434 if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags))
435 set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
436
Marcel Holtmanna55e1f32012-02-24 17:12:24 +0100437 if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
Szymon Janca6c511c2012-05-23 12:35:46 +0200438 set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
Marcel Holtmanna55e1f32012-02-24 17:12:24 +0100439
Marcel Holtmann8a7a3fd2012-02-24 17:09:38 +0100440 if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
441 hdev->dev_type = HCI_AMP;
442 else
443 hdev->dev_type = HCI_BREDR;
444
Johan Hedberg9f2aee82012-07-16 16:12:11 +0300445 if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
446 return 0;
447
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 if (hci_register_dev(hdev) < 0) {
449 BT_ERR("Can't register HCI device");
450 hci_free_dev(hdev);
451 return -ENODEV;
452 }
453
Johan Hedberg9f2aee82012-07-16 16:12:11 +0300454 set_bit(HCI_UART_REGISTERED, &hu->flags);
455
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 return 0;
457}
458
459static int hci_uart_set_proto(struct hci_uart *hu, int id)
460{
461 struct hci_uart_proto *p;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200462 int err;
463
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 p = hci_uart_get_proto(id);
465 if (!p)
466 return -EPROTONOSUPPORT;
467
468 err = p->open(hu);
469 if (err)
470 return err;
471
472 hu->proto = p;
473
474 err = hci_uart_register_dev(hu);
475 if (err) {
476 p->close(hu);
477 return err;
478 }
Marcel Holtmann0372a662005-10-28 19:20:45 +0200479
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 return 0;
481}
482
Marcel Holtmannbb72bd62014-07-11 07:12:57 +0200483static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
484{
485 unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) |
486 BIT(HCI_UART_RESET_ON_INIT) |
487 BIT(HCI_UART_CREATE_AMP) |
Marcel Holtmann6afd04a2014-07-11 07:12:58 +0200488 BIT(HCI_UART_INIT_PENDING) |
489 BIT(HCI_UART_EXT_CONFIG);
Marcel Holtmannbb72bd62014-07-11 07:12:57 +0200490
491 if ((flags & ~valid_flags))
492 return -EINVAL;
493
494 hu->hdev_flags = flags;
495
496 return 0;
497}
498
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499/* hci_uart_tty_ioctl()
500 *
501 * Process IOCTL system call for the tty device.
502 *
503 * Arguments:
504 *
505 * tty pointer to tty instance data
506 * file pointer to open file object for device
507 * cmd IOCTL command code
508 * arg argument for IOCTL call (cmd dependent)
509 *
510 * Return Value: Command dependent
511 */
512static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file * file,
Marcel Holtmann0372a662005-10-28 19:20:45 +0200513 unsigned int cmd, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514{
515 struct hci_uart *hu = (void *)tty->disc_data;
516 int err = 0;
517
518 BT_DBG("");
519
520 /* Verify the status of the device */
521 if (!hu)
522 return -EBADF;
523
524 switch (cmd) {
525 case HCIUARTSETPROTO:
526 if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
527 err = hci_uart_set_proto(hu, arg);
528 if (err) {
529 clear_bit(HCI_UART_PROTO_SET, &hu->flags);
530 return err;
531 }
Marcel Holtmann0372a662005-10-28 19:20:45 +0200532 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 return -EBUSY;
Marcel Holtmannc33be3c2007-05-09 09:15:45 +0200534 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535
536 case HCIUARTGETPROTO:
537 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
538 return hu->proto->id;
539 return -EUNATCH;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200540
Marcel Holtmannd2158742007-05-09 09:15:35 +0200541 case HCIUARTGETDEVICE:
Marcel Holtmannc7e0c142014-07-12 17:00:29 +0200542 if (test_bit(HCI_UART_REGISTERED, &hu->flags))
Marcel Holtmannd2158742007-05-09 09:15:35 +0200543 return hu->hdev->id;
544 return -EUNATCH;
545
Johan Hedberg63c7d092010-07-12 11:37:04 -0300546 case HCIUARTSETFLAGS:
547 if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
548 return -EBUSY;
Marcel Holtmannbb72bd62014-07-11 07:12:57 +0200549 err = hci_uart_set_flags(hu, arg);
550 if (err)
551 return err;
Johan Hedberg63c7d092010-07-12 11:37:04 -0300552 break;
553
554 case HCIUARTGETFLAGS:
555 return hu->hdev_flags;
556
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 default:
Alan Cox47afa7a2008-10-13 10:44:17 +0100558 err = n_tty_ioctl_helper(tty, file, cmd, arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 break;
Peter Senna Tschudina20890d2012-09-07 17:24:39 +0200560 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561
562 return err;
563}
564
565/*
566 * We don't provide read/write/poll interface for user space.
567 */
Marcel Holtmann0372a662005-10-28 19:20:45 +0200568static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
569 unsigned char __user *buf, size_t nr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570{
571 return 0;
572}
573
Marcel Holtmann0372a662005-10-28 19:20:45 +0200574static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
575 const unsigned char *data, size_t count)
576{
577 return 0;
578}
579
580static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
581 struct file *filp, poll_table *wait)
582{
583 return 0;
584}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585
586static int __init hci_uart_init(void)
587{
Alan Coxa352def2008-07-16 21:53:12 +0100588 static struct tty_ldisc_ops hci_uart_ldisc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 int err;
590
591 BT_INFO("HCI UART driver ver %s", VERSION);
592
593 /* Register the tty discipline */
594
595 memset(&hci_uart_ldisc, 0, sizeof (hci_uart_ldisc));
Marcel Holtmann0372a662005-10-28 19:20:45 +0200596 hci_uart_ldisc.magic = TTY_LDISC_MAGIC;
597 hci_uart_ldisc.name = "n_hci";
598 hci_uart_ldisc.open = hci_uart_tty_open;
599 hci_uart_ldisc.close = hci_uart_tty_close;
600 hci_uart_ldisc.read = hci_uart_tty_read;
601 hci_uart_ldisc.write = hci_uart_tty_write;
602 hci_uart_ldisc.ioctl = hci_uart_tty_ioctl;
603 hci_uart_ldisc.poll = hci_uart_tty_poll;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200604 hci_uart_ldisc.receive_buf = hci_uart_tty_receive;
605 hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup;
606 hci_uart_ldisc.owner = THIS_MODULE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607
Valentin Iliea08b15e2013-08-12 18:46:00 +0300608 err = tty_register_ldisc(N_HCI, &hci_uart_ldisc);
609 if (err) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 BT_ERR("HCI line discipline registration failed. (%d)", err);
611 return err;
612 }
613
614#ifdef CONFIG_BT_HCIUART_H4
615 h4_init();
616#endif
617#ifdef CONFIG_BT_HCIUART_BCSP
618 bcsp_init();
619#endif
Ohad Ben-Cohen166d2f62007-10-20 13:42:36 +0200620#ifdef CONFIG_BT_HCIUART_LL
621 ll_init();
622#endif
Suraj Sumangalab3190df2010-07-19 12:34:07 +0530623#ifdef CONFIG_BT_HCIUART_ATH3K
624 ath_init();
625#endif
Johan Hedberg7dec65c2012-07-16 16:12:02 +0300626#ifdef CONFIG_BT_HCIUART_3WIRE
627 h5_init();
628#endif
Ohad Ben-Cohen166d2f62007-10-20 13:42:36 +0200629
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 return 0;
631}
632
633static void __exit hci_uart_exit(void)
634{
635 int err;
636
637#ifdef CONFIG_BT_HCIUART_H4
638 h4_deinit();
639#endif
640#ifdef CONFIG_BT_HCIUART_BCSP
641 bcsp_deinit();
642#endif
Ohad Ben-Cohen166d2f62007-10-20 13:42:36 +0200643#ifdef CONFIG_BT_HCIUART_LL
644 ll_deinit();
645#endif
Suraj Sumangalab3190df2010-07-19 12:34:07 +0530646#ifdef CONFIG_BT_HCIUART_ATH3K
647 ath_deinit();
648#endif
Johan Hedberg7dec65c2012-07-16 16:12:02 +0300649#ifdef CONFIG_BT_HCIUART_3WIRE
650 h5_deinit();
651#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652
653 /* Release tty registration of line discipline */
Valentin Iliea08b15e2013-08-12 18:46:00 +0300654 err = tty_unregister_ldisc(N_HCI);
655 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 BT_ERR("Can't unregister HCI line discipline (%d)", err);
657}
658
659module_init(hci_uart_init);
660module_exit(hci_uart_exit);
661
Marcel Holtmann63fbd242008-08-18 13:23:53 +0200662MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
664MODULE_VERSION(VERSION);
665MODULE_LICENSE("GPL");
666MODULE_ALIAS_LDISC(N_HCI);